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Lecture22 - speed of light A plane wave’s contours of...

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is called a plane wave . A plane wave's wave-fronts are equally spaced, a wavelength apart. They're perpendicular to the propagation direction. Wave-fronts are helpful for drawing pictures of interfering waves. A wave's wave- fronts sweep along at the
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Unformatted text preview: speed of light. A plane wave’s contours of maximum field, called wave-fronts or phase-fronts , are planes. They extend over all space. exp[ ( )] E i k r t ϖ ⋅ -r r % Usually, we just draw lines; it’s easier....
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